How many seconds until you get the air bubbles? Figure maybe 45 mph with a LT-40 is 66 ft/sec. If you do a 10 second dive that's 660 feet drop.

Have you ever held a LT-40 to a 660 ft dive at full throttle? They climb at full throttle.

I don't believe any of my clunks move much forward. I place them 1/2" in from the rear of the tank.</p>